Definitions. The following words and phrases, when used in this chapter,
shall have the meanings given to them in this subsection, unless the
context clearly indicates otherwise:
AIRPORT ELEVATION
The highest point of an airport's usable landing area measured
in feet above sea level.
AIRPORT HAZARD
Any structure or object, natural or man-made, or use of land
which obstructs the airspace required for flight or aircraft in landing
or taking off at an airport or is otherwise hazardous as defined in
14 CFR Part 77 and 74 Pa.C.S.A. § 5102.
AIRPORT HAZARD AREA
Any area of land or water upon which an airport hazard might
be established if not prevented as provided for in this subsection
and Act 164 of 1984 (Pennsylvania laws relating to aviation).
APPROACH SURFACE (ZONE)
An imaginary surface longitudinally centered on the extended
runway center line and extending outward and upward from each end
of the primary surface. An approach surface is applied to each end
of the runway based on the planned approach. The inner edge of the
approach surface is the same width as the primary surface and expands
uniformly depending on the planned approach. The approach surface
zone, as shown on Figure 1, is derived from the approach surface.
CONICAL SURFACE (ZONE)
An imaginary surface extending outward and upward from the
periphery of the horizontal surface at a slope of 20 feet horizontally
to one foot vertically for a horizontal distance of 4,000 feet. The
conical surface zone, as shown on Figure 1, is based on the conical surface.
DEPARTMENT
The Pennsylvania Department of Transportation.
FAA
The Federal Aviation Administration of the United States
Department of Transportation.
HEIGHT
For the purpose of determining the height limits in all zones
set forth in this Airport Overlay Zone and shown on the Zoning Map,
the datum shall be mean sea level elevation, unless otherwise specified.
HORIZONTAL SURFACE (ZONE)
An imaginary plane 150 feet above the established airport
elevation that is constructed by swinging arcs of various radii from
the center of the end of the primary surface and then connecting the
adjacent arc by tangent lines. The radius of each arc is based on
the planned approach. The horizontal surface zone, as shown on Figure
1, is derived from the horizontal surface.
LARGER THAN UTILITY RUNWAY
A runway that is constructed for and intended to be used
by propeller-driven aircraft of greater than 12,500 pounds' maximum
gross weight and jet-powered aircraft.
NONCONFORMING USE
Any preexisting structure, object of natural growth or use of land which is inconsistent with the provisions of this Subsection
F, or any amendment to it.
NONPRECISION INSTRUMENT RUNWAY
A runway having an existing instrument approach procedure
utilizing air navigation facilities with only horizontal guidance,
or area-type navigation equipment, for which a straight-in, nonprecision
instrument approach procedure has been approved or planned.
OBSTRUCTION
Any structure, growth, or other object, including a mobile object, which exceeds a limiting height set forth by this Subsection
F.
PRECISION INSTRUMENT RUNWAY
A runway having an existing instrument approach procedure
that utilizes an instrument landing system (ILS) or a precisions approach
radar (PAR). It also means a runway for which a precision approach
system is planned, and is so indicated on an approved airport layout
plan or any other planning document.
PRIMARY SURFACE (ZONE)
An imaginary surface longitudinally centered on the runway,
extending 200 feet beyond the end of paved runways or ending at each
end of turf runways. The elevation of any point on the primary surface
is the same as the elevation of the nearest point on the runway center
line. The primary surface zone, as shown on Figure 1, is derived from the primary surface.
RUNWAY
A defined area of an airport prepared for landing and takeoff
of aircraft along its length.
STRUCTURE
An object, including a mobile object, constructed or installed
by man, including but not limited to buildings, towers, cranes, smokestacks,
earth formations, and overhead transmission lines.
TRANSITIONAL SURFACE (ZONE)
An imaginary surface that extends outward and upward from
the edge of the primary surface to the horizontal surface at a slope
of seven feet horizontally to one foot vertically. The transitional
surface zone, as shown on Figure 1, is derived from the transitional surface.
TREE
Any object of natural growth.
UTILITY RUNWAY
A runway that is constructed for and intended to be used
by propeller-driven aircraft of 12,500 pounds' maximum gross weight
or less.
VISUAL RUNWAY
A runway intended solely for the operation of aircraft using
visual approach procedures.